LEHMANN, JOHN W.,MIHALIK, TERESA ANN,PAGEARD, JEAN-LUC
申请号：
CA2607175
公开号：
CA2607175C
申请日:
2006.04.17
申请国别(地区):
CA
年份:
2012
代理人:
摘要：
A catheter (34) includes a first expandable membrane (62) having a firstpressurization limit and a second expandable membrane (64), having a secondpressurization limit, wherein the second pressurization limit is greater thanthe first pressurization limit, the first expandable membrane defines acooling chamber, the second expandable membrane being disposed around thefirst expandable membrane to define an junction (57) therebetween. Thecatheter includes a coolant injection lumen in fluid communication with the atleast one fluid inlet port and the cooling chamber, and a primary coolantreturn lumen in fluid communication with the at least one fluid outlet portand the cooling chamber. The coolant injection tube, the cooling chamber, andthe primary coolant return lumen define a first fluid pathway. The catheterfurther includes a secondary coolant return lumen in fluid communication withthe at least one fluid outlet port and the junction. The junction and thesecondary coolant return lumen define a second fluid pathway. The catheterprovides a fail-safe feature by selecting the appropriate first and secondpressurization limits for the first and second expandable membranes.
